Re: Inexplicable disk activity trying to load modules on devfs

From: Daniel Jacobowitz (
Date: Sat Jun 15 2002 - 18:04:26 EST

On Sat, Jun 15, 2002 at 03:44:30PM -0700, Andrew Morton wrote:
> Daniel Jacobowitz wrote:
> >
> > I just booted into 2.4.19-pre10-ac2 for the first time, and noticed
> > something very odd: my disk activity light was flashing at about
> > half-second intervals, very regularly, and I could hear the disk
> > moving. I was only able to track it down to which disk controller, via
> > /proc/interrupts (are there any tools for monitoring VFS activity?
> > They'd be really useful). Eventually I hunted down the program causing
> > it: xmms.
> >
> > The reason turned out to be that I hadn't remembered to build my sound
> > driver for this kernel version. Every half-second xmms tried to open
> > /dev/mixer (and failed, ENOENT). Every time it did that there was
> > actual disk activity. Easily reproducible without xmms. Reproducible
> > on any non-existant device in devfs, but not for nonexisting files on
> > other filesystems. Is something bypassing the normal disk cache
> > mechanisms here? That doesn't seem right at all.
> >
> syslog activity from a printk, perhaps?

Nope. No log activity whatsoever.

Daniel Jacobowitz                           Debian GNU/Linux Developer
MontaVista Software                         Carnegie Mellon University
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